Automatic telephony.



W. Wl. BHUCEJR.

AUTOMATIC TEUFHONY.

APPLxCMloN FILED Mov. 4. w11,

Paname@ De@ 'EL 91.5.

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W. M'. BRUCE, JR. AuoMAnc TELEPHONY.

APPLxcATxoN mien Naw4 4. 1911.

Patented, Dec. 7, i915.

SHE TS--SHEET 2.

w. m. BRUCE, 1R. AUTOMATIC TELEPHONY.

APPLICATION FILED NOV. 19H. Y 1 m x Vuenefl DQS. wf, v.

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6 SHEElS nShET Patened Dec. T, 12H

W. M. BRUCE, in.

AUTDMATIC TELEPHONY.

APPucAnoN man Nov.4.1s1\.

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'WILLIAM M. BRUCE, JR., OF SPRINGFIELD, OHIO, ASSIGNOR TO THE INTERNATIGINALV AUTOMATC TELEPHONE COMPANY, OF SPRINGFIELD, OHIO, A. CORPORATION" OF OHIO,

To all fur/tom t may concern.'

vBe it known that l, lVILLIAiii M. Bauen, Jr., a citizen of the United States, residing at Springfield, in the county of Clark and State of Ohio, have invented. certain new and useful Improvements in Automatic Telephony, ol which the following is a spiufificatioin f My invention relates to in'iproveinents in automatic telephony and especially tothe I construction of thc automatic switches and primarily a flat or single'nioifeinent switch it has terminal Yconnections or banks arranged in dil'fercnt levels with wipers to en# gage each and with ineans'for preventing electrical connections with the wipers related to one bank when a connection is to lee made with the terminals of another bank.

For the purpose of illustration I have shown a switch having two banks, each `bank adapted' to handle fifty lines or having fifty sets of terminal contacts, thus making pro# visions for onelnindrcd connections in one switch, each ot these banks has a set of lwipers amiropriated to the bank and the switch has operating mechanism for said wipers and also means for switching the wipersinto or out of electrical connection so that when it is desired to make a con-r nection in one bank, the wipers to that bank will be in electrical connection and the wipers relating to any other bank will be out of electrical connection. In this particular case, l have illustrated the switch ,and its electrical connections as used for a line' or linder switchn that is one'in .which a 9 a lwhen a subscriber removes his telephone `from the hook switch for the purpose of establishing a connection, the switch is u started and` automatically moved until an electrical connection is made with the ter- Specication of Letters Patent.

Application ed November 4,'19l1.

AUTOMATIC TELEHNY.

Patented Dec. *7, 1915.

Serial No. E/L92.

niinal of that line and` carried into another switch, such as a selector or connector switch, the movements of the selector or connector switch being afterward effected by `impulses sent from a suitable calling device at the subscribers station. The invention is applicable to selector or connector switches. In this system a number ofswitches less than the subscribers lines are used, usually about ten per cent. or ten switches to each one hundred lines and means are ,ilso provided so that the lines are grouped, say ten lines to each switch; but the switches are so interconnected that in the event that the switch assigned to one group of lines is busy, connections will be automatically/extended to the other switches so that any one of the one hundred lines might use any one of the ten switches in the event that the other nine switches are busy.

In the accompanying drawings: Figure l is a diagrammatic View showing the distribution of the line groups to the different switches, there being ten groupsr and ten switches, live of` the groups being assigned to one level or bank of eachV of the'switches and the other live groups assigned to the other level or bank ot' each of said switches. Fig. Q isa diagrammatic `view of the starting circuits for the switches and the meaii's for extending the starting circuits of one group to the switch ot' another group in the event that vthe switch is busy. Fig. 3 is a diagrannnatic View of the start-ing circuit for one switch and the circuit for continuing the operation of the said switch in finding the line of the calling subscriber. Fig. ,el is a diagrammatic View showing particularly the circuit for cutting out the line or starting relays when the switch has found the calling line. Fig. r.Vis a diagram showing all the heretofore fplescribed circuits. Fig. G is a plan View of the mechanical parts of one of the switches. Fig. 7 is a partial sectional elevation of the same show.

ing the arrangement of the contacts.

It may be stated in the beginning that the particular forni of switch which I have shown in connection with my invention. is

substantially the same as is now in use with' the so-callcd Lattig & Goodrum system; that is, one in which a-series of-Wipers of a central shaft are' adaptedtobe moved step' by step Yover bank contacts or terminals-by the aid of a motor' magnet with a spring attached to the shaft to return the same with its wipers to normal position when the switch is released by a release magnet and in this particular form of switch there are f j lninals for each line, two of these being assigned to the line and mate,va third form mg part ot the operatmg circuit for ycontinuinp,- the movement ot' the switch until the line/1sfound, and a fourthA for forming part of the circuit for operating the cut-off 'relays which cuts out the line relay Awhen the switch has found the calling line; there is also provided on the shaft 'a wiper for eachfot these terminals; that is, there being tour iiipersadapted under the conditions of operation totorm a part of the circuits named. 'ln my improved system l use the saine general form of switch, and the same general arrangement of operating mechanism` but I provide an additional bank of terminals and an additional set of 'Wipers making; eight rows of' terminals and eight wipers instead of four as in the other case, so that l provide terminal connections in each switch bank for one hundred lines instead of tty and I providemieans inthe switch amA the switch circuits/so arranged that when one set ot' wipers is in use in making connections with any one of the line contacts'in one bank the wipers for the other bank are disconnected and vice versa.

Referring to F lgs 6 and 7, 1 is a ratchet wheel, mounted on a suitable shaft 2, which carries the wipers 3, 4,5, 6 forming one set and 7, 8, 9, 10 forming the other set. These vwipers are adapted to move over the sets of terminal contacts 11, 12, 18,14 of one bank and 15, 16, 17, 18 ofthe other bank. The motor magnet 19 having a suitable armature 20 carrying a pawl Z1 to engage in the teeth of the -ratchet l, serves to move the switch shaft and wipers step by step when the magnet isienergized and denergized in the usual' way, and the release magnet 22 serves to release the operating pawl aswell as, ie holding pawl 23 when the switch is o be returned to normal, being moved to its normal position by the coil spring 24 attached at one end to the switch frame and the other to the shaft There is also provided on the frame of the switch a spring,r arm 25 which is termed the off-normalcontactwhich when the switch is in its normal position is forced into engagement with contact 26 and which when the switch takes its rst step, moves 4away from the contact and engages the contact 27.

As illustratedy for the purpose ofI this ap- 4tending it to the other switches.

plication the operation of starting the switch to find a line of a calling subscriber in the irst group of titty lines coming into this switch will be substantially the same as in the system now in use; that is tosay, therewould be a certain number ot' switches assigned to each one hundred lines, usually about ten and the lines would be arranged in groups ot' ten and these groups would be multiplied into the different switches assigned to tne group.` Where iiftyline connections only are provided for in the switch,

running to each switch with means for ex In my system there are two starter wires to each switch, one for the first group oi ten in the first lifty and one t'or the second group of ten in the second fifty for starting the switch.

This general arrangement being illustrated in Fig. 1.

In the simplest form of my invention asV l have illustrated it, the first ten lines in thc first group of fifty are connected to the upper bank of the switch and the wipers which cooperate with these lines are normally in yelectrical connection with the other parts of the switch and the starter wire from this group of tenis normally in operative connection with the switch so that when acall is initiated in any one of this ten group the ln ythe known system there is a single A.starter Wire common to each group of ten lines.

switch will be operated in the usual way;

The ten lines of the second group of titty are assigned to the same switch but to the" other or lower bank and the wipers which coperate with. thls bank are normally in' 111-' Vmeans of which all of the active circuits of the switch mechanism are shifted rom'the first set of Wipers to the second set of wipers. This would perhaps be best understoodby describing Vthe operation of the switch in selecting the line of a calling subscriber, and

the way the switch is started and its operation continued by removing the receiver from the hook switch.

operative condition and the starter Wire,is

In Fig. 2, a, b, c and cl represent subscribers .stations i'n different groups as#l signed to the same switch, @being in the first group of the first fifty, b in the rst group incasso of the Erst fty and d in the second group of the second fifty,v AClosing the switch hook 28 in station (l. against contact 29 operate the -line' relay a1 from battery a5 in the well known manner. The relay ais thus energizedand pulls up its armature spring 30 againet the groundedcontact 31 and thus,

grounds the starter wire 32 Which'leads to contact spring 33, thence to Contact 34, Wire B5, contacts 36, armature spring 37, wire 38, contact 39, armature spring 40, relay 41, battery and ground,'rciay 41 which I call the motor magnet relay is thus energized and its grounded armature spring 42 engages con;

tact 43 connected to wire 44 to 'point/5 where the circuit divides one branch going by wire 46 to the motor magnet 19 to bat-- tery and ground. This energizes the motor magnet 19 and causes it to attract its armature which brings the operating pawl into the tirst notch of thcl ratchet wheel 1 on the switch, motor magnet armature 20 also carries contact so that as it is retracted the circuit for the motor magnet relay 41 is broken-at contact 39 and its armature spring 4:2 drops back which in turn. breaks the circuit for the motor magnet 'at 43 and it becomes denergizcd anddrops back. AThis causes the switch to move one step which releases the grounded cti-normal contact 25 and permits it to engage the contact 27 connected by wire 48 to relay i9 and thence to battery and ground. This relay I4:9, I call the starter wire extension relay and when energized pulls up its armature spring 33 and breaks the starter wire circuit at back ,ation continues until it finds the calling contact 3l. The armature spring 33 engag switch as hereinafter more fully described. lhlhen `the switch is thus Started the oper-- line over the usual operating circuit which is not shown in Fig. 2 but which will be pointed out later. l

In the event that the call should originate at station l) by the closing of' the hook switch 52 on the Contact i529, the line relay '51 would be energized 'from battery b5 in the manner before described, Varmature spring i530 would be 'closed against ground Contact `531 and the starter wire f'thus grounded, which starter wire leads to armature spring,r 51 of the relay 49, and by contact 52, wire 53,/ point 54, to relay magnet 55, battery and ground. This cnergizes the-relay magnet 55 which thus pulls up its armature spring 37 breaking the circuit of the starter wire (L32 at con y tact 3G and' closing a circuit Jfrom point 54,

described the-only diderence in'the oper- Switch hook at b overfthat at a, being the energizing of the magnet relay 55 which cuts out the starter wire L32 and cuts inthe starter Wire 532. .The relay magnet 55 has an additional function; that is, it operates the escapement of the two movement four wiper auxiliary switch indicated at a, the wipers of this' auxiliary switch are, connected through circuits, in the manner hereinafter described, to the .line and operating circuits of the switch correspondingto the tour terminals in each bank ot the switch and the four sets of two contacts each of this auxiliary switch are connected by circuits herein after described, to the four main wipers coperating with each switch bank so that when the auxiliary switch is moved from its first to its second position the wipers of the .first bank are cut out of active operation and the wipers of the second bank are vcut into active operation. When the auxiliary switch wipers are once moved to the second posi tion they are held in this position until the switch is released when the wipers are returned to their normal or iirst position thus cutting in the iirst ,group and cutting out 'the second group of Wipers for the Vmain switch.

Having thus described the startingr of switch al byy a subscriber in the irst group of the iirst fifty or the first `group ot the second fifty I will now explain how the starter wires are extended to the switches pertaining to the other groups so that other calls trom these same groups will be translt will be remembered that the starting @circuit rr and L32 from the respective groups pass through the arn'iature spring` Il?) and 51 which are controlled by the starter extension relay lf) and that this relay 49 is energized by the oit-normal contact grounding the contact 27, armature springr 33 is thus caused to engage contact 50 and armature springT 51 engages contact 57; the Contact 5T is connected by wire 595 to arma ture spring 5) and Contact 5() is connected by wire G0 to armature spring 61k of a slow relay an?. Armature spring 5f) engages hack contact (S2 andarmature spring S1 engages back contact 63. From contalct 63, wire (3Jfl leads to armature spring, 7135* in switch 71 which corresponds to-thc iirimiture spring 33 in switch al and normally engages contact 72Min the circuit for the motor magnet relay l1,

- Contact fiL'is connected by wire G5 toy armature spring L51 in switch 51 which normally engages back contact 7152 inthe No. 2 starting circuit of switch 5* which is in the circuit ot' thc relay 55 so that whenthe. relay 49 oi' switch im is energized both the starter wire fr and bi are extended it' the the switch'd0 which will lead into the switchv b1" into the next succeeding switch' 4&0@

'I `started by the closing ol" apline' in any n group while the. finder switch. assigned to `that from rontacts (i2 and (i3 ot' switch 4provision is made for 'th/rough it the relay af is in itsnoruial or denergized condition. These extensions ai'e through the wires (isL and to the second switch b and in the event that a call should afterward originate in the first group or group c, startery wire'r/L' would be tlosed to ground and being extended over wire (')Jf would cause the switch '/f" to operate in the saine manner as switch al herctijifore described. In case a call should originate in the second or o ygroup the starter wire 7); wouldbe closed wires 7)6 and 7;5 lead directly to and are connected into starter wire c32 and di lead ing Afrom the c and d groups so that incase. switch el" is engaged or in case all ot these switches werefengaged'. calls from either in.

b, c or Jgroi'ps would go into switch d1 over thej extended starter wires c 'and ci ofthe switch ci" which lead to the armature springs `33. and 51 olA the 'switch all" and in the event that this switchwere busyk the ,starter wire would be still further extended over extended starter wires d, and (764 of starter Wire from the next two rsucceeding groups infthe saine manner as shown in the .c d andfclwgroups.

' In order that a second switch may not be that line is picking up the line terminals holding open the starter extension lines at `the contacts G2 and 63 during the time theswitches are in,

operation and this is accomplished by the relay as which 1s a slo'w relay; that is, one

which is energized when it receives current` but is slowin releasing and will hold up its armature during a series of impulses. This relay is in a branch circuit of the motor magnet circuit extending from point 45 by wire 66' to relay 61battery and ground so that it is energized simultaneously with the energization o'fpthe motor magnet 19 and ,it the. motor magnet is successivelyr energized by fairly rapid current impulses passing same impulses passing through relay am will cause this relay to heid up its armature springs and thus hold open: the startervextension wires 64 and (i5 imtilthese impulses cease when the switch isbroughi a, resi, relay a denefgized fmd" lay 4l would be subsequentl)1 energized over To avoid complication the circuits for continuing the operation of the respective sw'itcliesand someot the various other circults are omitted in F1g.' 2 and it now remains to briefly describe the circuit vtor continuing the operation of the switch until the calling line is picked up which is shown in Fig'. 3. In

lines in each of' two groups; that isfin the o group and group these lines are indicated by la 2 3a and' l" 2b 3", each of the lines and mates in the a group extend -to terminals in the upper bank of contacts, while each of the lines and its mate Iin the group extend to similar vterminal contacts in the lower bank o't' the switch al" and these i lines are provided with the line relays a1, a,

f ci for the a group and /H, b3 for the this figure 'I have shown'three subscribers--. Y

group as hereinbet'ore described. The armatureA spring 3() of each of these relays has in addition to the starter wire 'contact 311 a back contact G7 which is connected by wire (i8 .to a. terminal fd" inthe upper bank or D69 vin the lower bank. These terminals as or?)lm of each ot' the upper and lower banks of each switch are therefore normally grounded through the grounded spring 30, back contact (37, and wire (S8. Two of the wipers 0Vf and bl" one in the upper bank andone in the lower bank are adapted as the .switch is moved-to contact successively with thelter-` ininalsce and f of the respective lilies and these wipers are connected by wires@T1 and bl to. contacts 11.7 and Lizin theI auxiliary switch a with which the auxiliary switch wiper ai contacts in thetirst or second position. 'iper 117 is connected by wire 7l, to point T5, to ywirela which is connected to armature spring 3T of the relay magnet 55. The auxiliary` switch wiper a. is therefore in a branch ofthe circuit which energizes the motor inagnetrelay vllv so that the closing.,r of theline of any subscriber in group' aA which results in the energizing of motor magnet relay all as before described, also places grounded battery on thewiper -a73 over the circuit from grounded battery at relay all, armature spring Ofcontact spring 39,-wire 38. to point 75, wire 74, and auxiliary .switch wiper am. As soon. as the main switch has taken its first step, thereforerb l ins-l energizing and denergizing the motor/,nia

netV 4;? asy before .described and 'the breuk f the starting circuit. the motor magno the ci rcuitbefore described from batteryrielayel, armature spring flO, contact 39,v wire 38:, connecting point 75, w1re fil, auxiliary 'switch wi )er a contact o72 e wire anmai wiper al", terminal contact a, wire 68, con-. tact (i7, and grounded arinaturespring 30 l providing the said armature spring 30 'is in its normal position. .This will cause the y motor `magnet 47 to be energized which will' in turn break the circuit of the motor magnet relay` 41 which will in turnbrealr-the circuit lands on.afcontact (,L which is grounded vover the wire 168 'and spring 30, the switchv will therefore.continue t'o operate by irnpulses thus received.. It, however, the line relay a., c?, a3 ot. either ot' these lines has been energized, its armature' spring ,30 will have. pulled up so as to break the grounded circuit for its terminal (if) at Contact 67, the motor magnet relay will thus fail to receive current and the switch will thus stop. ln oase a call lshould have originated in the b group thus groundingr vthe starter wire 532, the relay 55 will llave been operated'as before described, thus changing the armature spring v37 from back contact 3G 4to contact 5G which would connect` starter wire 32 to the motor magnet relay circuit'as before described and would. by moving the auxiliary switch, move the auxiliary wiper-c", thus leaving the circuit ot' the main switch wiper am open at contact a. and closing the circuit of the main wiper of at contact o so that the switch would continue to operate until it finds a non-grounded terminal 7;"9 in the lower bank. The subsequent opening of the operating circuit 'of a line in group a at contact (S7 by energizing a line relay in that group would haveno ei'l'ect upon the operation of the switch since the operating wiper u?" pertaining to that bank would be disconnected or connected to an open circuit over which no current Aimpulses could be received or transmitted until the auxiliary switch had been ret'urned to its normal position. A lI have thus described the method of starting and continuing the operation offthe switch until the subscribers line whichlias been closed at the switch hook is found ,or

I picked up by the switch) lt now remains to describe how the main lines or talking circuits are connected through to another switch and the operating circuits disconnected when the switch comes to rest upon the calling subscribers line terminal.

Fig. Jf shows the circuit tor cut-ting out the operating` circuits. 'lhe circuit ot' each line relay al, o, etc., passes through circuit breakers 7)", lf controlled by the cut-onttre lays Hf, 7;", so that when these relays are energized the a rmature ot the relays operate the circuit breakers fr". r/T and 7;" and of vand break the circuits ot' the line relays. {l} and b'. thus taking these relays off ot' the main line or talking circuit formed by wires l, 1b which extend through to their terminal contacts in the switch bank. The means tor energizing the cut-oli' relays us and /f are as follows-: Uw-l side ol'l each of these relays is connected 'to battery and ground as indicated irlig. l. The other side ot' therelayy f is connected by wire-a7 to terminal 5577"" in the'upper bank of the switch while relay 298 is connected `by wire 727 to the Contact Z2" of the lower bank. These contacts are adapted to be engaged by the wipers als and 578 as the wipers are advanced over the contacts. and thesel wipers are connected by wires am and bltl to terminals L80 and i580 in the auxiliary switch a, the terminal 0,80 being normally engaged by the wiper am which is in turn connectedto wire 82, contact S8, armature spring 84, wire to ground. The ar- Vmature spring 84 is controlled by relay S6.

This relay 8G is a slow relay and is adapted to be energized over the circuit from grounded battery, relay 86, wire 87, contact 88, ar-` mature spring 89 of relay 41wire 90, contacts 91 and to ground, when the motor magnet relay il is energized. lRelay 86 is retained energized so' long as circuit impulses are passing through the motor magnet relay thus holding the grounded connection for wiper asl open at contacts 83 and 81h So soon as the impulses cease the slow relay 8G becomes denergized, the contact Si is closed,

thus putting ground on the side switch wiper c, which will in turn ground terminal contact a" through the wire am and wiper of and thus operate the cut-off relay es. This will take place only when themain switch wiper comes to rest su'liiciently long `to permit' the slow relay 86 to become denergized. ln case the call has originated in the l) group the auxiliary switch c will, upon the first impulse in the starter wire,

move to contact lf" in which casev the ground connection through contacts Si' and 83, wire 82 and wiper ai will be transferred to the cont-act bs" and thence over thecircuit wire bm, switch wiper o, terminal Fi", wire 5"' to cut-ott' relay The first two terminals in each of the banks is reserved for the line and mate of each subscribers circuit, as are also the lirst two wipers of each bank, and these wipers are "connected (as indicated by the heavy lines in Fig. 5v) to the terminals 93. 94, 95 and 9G of the auxiliaryswitch enflure auxiliary switchwipers 9T and 98 being connected by 'wires 99 and l0() to armature springs 101,102 on the relay 86. These springs heilig normally engaged with back contacts 1025, lOJ'fLot wires 105 and 10G which lead to the next switch, lthese wires 105 and 106 and connections just described form a tie between the wipers (reserved `for the main line or talking circuit) inthe line or finder 'switch and corresponding wipers in the next or first selector switch, and this tie is held open at contactsllll. lOl/, 103 and 104 so long as the. slow relay 8G is energized, which is as long as impulses are passing through the operating relays for operating the switch wipers tol the proper terminals.' in this case, as before, it will be noticed that .the switch wipers for the upper bank are lio normally in circuit with the auxiliary switch wipers and through themv to the tie "wire leading to the next switch. Butiii the event that a starting impulse comes from the other bank it transfers the auxiliary switch Wipers to the other set of contacts ind thus brings the line and mate of the second bank over the auxiliary switch'wipers 9T andv 98 and through the contacts 101` 102. 103. and 104.

to the wires 105 and 106 so that these lines in either casewill be held open so long as the switch is being operated but will be immediately closed through Ito the next switch f so soon as the inder switch stops on the calling line and the slow relay SG drops back. i

The release circuit from the first `selector or subsequent switch -is shown at'107 and vpasses through back ,contact 108 armature vspring 109, on the slow relay a@ thence by wire 110 to spring 111 on the oft-normal switch and whenererthe switch in an advanced positionY this spring engages contact 112 whichr connected 'by wii'e 113 to the release magnet 11-l thence vto battery and ground. A branch line 115 leads from 118 tothe auxiliary switch'release magnet 116 to battery and .ground so thatan 'impulser over thefwire 10Ti would operate both release magnets 114: and 11G and cause ther switches to be released and this release circuit is held open at the contact 108 and 109 while the switch is operating by slow relay am. The release magnet 111 is also providedv with an armature spring 11T, which. when the inagnet is energized, closes on contact 118 which is connected by wire 119 to electrical contact 120 in the circuit for the slow relay 86,l

so that when the release relay is energized it also energizes the slow relay 86 and thus opens the main or talking circuitvwhile the main switch wipers are returning over the terininal contacts to their normal position.

It will be 'seen that it' a call originates in thel upper bank, this call passes through the switch by operating the saine in a vmanner similar `to that heretofore described 4forthcother bank. rlfhe upper bank wipers are cut outand the lower bank wipers are cut in and' the switchrtheii perfornis its operation in connection with the lowerbank of contacts in substantially the saine manner. In either case the starter wires relating to both the upper and lower banks are extended to other switches so that calls originating in either of these groups relating to these banks would be transferred to other switches.

It will `be notedthat they circuitfor the slo'wrelay S6 passes through contacts 91. 92,. which are controlled by relay 17 which is.'

also a slow relay and that this relay 17 is in a branch of the circuit for the motor magnet being connected to grounded battery Gr B and by wire120 to Wire 46 at point 45 so that this relay is energized whenever the motor inagiietis energized which takes place incasso after the energization of the motor magnet v relay 41 and the slow relay 86. The energization of the relay 47 opens the circuit for the relay 86, but inasmuch as the relay 86 slow it does not immediately drop back and yas the'motor. magnet is immediately denergized and the switch advanced one step, the

slow relay 86 finds ground through the operating circuit or' the switch which includes the fourth wiper of themain switch, as heretofore described, and remains energized so Vlong as the switch *continues in operation.

As soon as the switch stops by the failure of thefourth Wiper of the series to find ground the relay i11 is denergized and the f relay S6 `also becomes denergized,y which in turn opens the circuit for the relay 17 which becomes denergized and in turn opens the circuit for the relay a62 so that the armature of each of these relays falls back in the order mentioned. `The denergizing of the relay 17 closing contacts 91, with the switch inits advanced position puts ground from x magnet controlled by the contacts 42 and 13.

In Fig. thisfrelay is shown in a circuit conqtroiled by the slow relay 4T. vwhich in this case is put in the branch circuit of the niotor magnet and which extends from point 45 by the wire 121 to relay JJ to ground and battery.` The circuitr for the relay (12 extending from ground wire G. through contacts 43,42 Wire-66, relay a-f to groundedy battery. The operation is substantially identical vexcept the additional relay 1T is interposed for other purposes and this relay in Fig. 5 is made to control the relay d instead of having it controlled direct from the motor magnet circuit.

Having thus described my invention, I claim: f

.1. In a switch for automatic exchan es, a series of terminal contacts arranged in anks and a series of wipers supported on a com# mon shaft and arranged in sets, one set for each bank, each of said wipers adapted to forni a 'link in a circuitincluding one ot Vsaid terminals, means for operatingithe shaft carrying the wipers by current inipulses, and means operated bysaid' current impulses for disconnecting one s*tof.said

Wipers and connecting another set of isaid Wipers. j l

Y 2. In a switch for automatic telephone exchanges, a series` ofv contacts arranged in banks andl a series 'of wipers, one' set for each i bank, means for causing the Wipers to move step by step o'iler said contacts by current impulses, an operating circuit for each of said banks, and means for disconnecting one of said sets lot", wipers and connecting anl other set of wipersby' the 'current impulses passing through said operating circuits.

In an automatic switch, a plurality of banks ot' terminals arranged'in sets and sets of wipers, one set for each bank operated by current impltlses, terminalsdn each of said banks connected to subscribersv lines, an extension circuit throughsaid switchfor said subscribers lines andfmeans operated by said current impulses for automatically connecting said extension' circuit to the line wipers traversing the bank to which a sub.-

scriber is connected whenever said subscribi ers line is to be connected through said switch for conversation.

4. In a switch for automatic exchanges, a plurality of sets of bank contactsand sets of wipers one for each bank, means forl operating the lsaid Wipers by current impulses over said bank terminals, a main line or trunk circuit leading. from said switch, and means for connecting one set of Wipers to said line or trunk and disconnecting the other set of wipers therefrom by the current impulses for operating said-wipers.

5. In a switch having sets of terminals for subscribers lines ar 'anged in a plurality of banks, sets of wipers, one set for each bank,. a line'or trunk circuit connected to said switch and means for connecting said line or trunk circuit to wipers in either set,

operating means for causing said Wipers to move step by step over said terminals bycurrent impulses, which are Aalso adapted ,to establish a connection between said line or trunk and one set of Wipers and disconnect' the same from the other set of wipers.

G. A linder switch for automatic telephone exchanges, having a series of contacts arranged in banks and a set of wipers for each bank, means for operating the wipers by current impulses transmitted through contacts in one of the banks, and means for forming an electrical connectionbwith a set ot' wipers corresponding to the contact over which the cuirent impulsesA fiowdand electrically disconnecting the other set of Wipers.

T. In a finder switch having a plurality of banks and sets of wipers one for each bank, means for operating the wipers kby current impulses transmitted over contacts in one of the banks, means operated by saidimpulses to electrically connect one set of wipers and disconnect the others and also for extending the lines over which the startl ing impulses are transmitted to other switches as described.y f'

8. Inaswitch for automatic exchanges, a

plurality of banks, subscribers stations-con` .nected to said'terminals in each bank, a series of Wipers arranged in sets, one set for each bank, means for operating thel terminals step by step 'over said contacts by impulses passing through contacts in one of said banks, an Vauxiliary switch having wipers corresponding to the wipers relating to each bank and means for com-iecting the "wipers to said auxiliary switch to the main wipers relating to ther bank over which the impulses are passing and disconnecting them from the wipers of other banks.

9. In a finder switch for automatic eX- changes, a series of terminal contacts arranged in banks, multiple wipers, one set for each bank, subscribers stations arranged in groups with ditferent groups in" dierent each switch, and means connected Withthe starter wire for shifting the connections lfrom one set of Wipers to another.

banks,- astarter Wire from each group to' 10. A switch as described, terminal con- A tacts arranged in groups and a lseries of switches less in number than the number of terminals and multiple connect-ions fromthe different terminals to the different switches, a plurality of banks of terminals and sets of wipers and sets of starter wires, one for each bank and means connected with one or more of the starter wires to shift the connectionsA with the wipers as and for the purpose specified 1l. In an automatic switch having a series of terminal contacts arranged inbanks and Wipers for each bank, means for electrically disconnecting one set of Wipers and electrically connecting another` set as the switch is operated7 and means for restoring the' normalcondition of the wipers when the switch :isrestored 'to normal position.

.12. In a switch such as described having a pluralityt of sets of banks and a plurality, of sets of wipers with means for' electrically connecting one Set of Wipers to correspond with the bank to be selected, electromagnetic means for operating saidy switch and a release magnet for restoring said switch to normal condition, and means 4associated withA said release magnet for also restoring the electrical connection with'the switch wipers to nbrmal condition when the release magnet is operated.

13. In a switch such as described, havingfe plurality'of banks, and a plurality of-set's' of wipers for operating therewith, subscribers stations arranged in groups, one or moregroups being connected to one bank and' one or more groups connected to the` other bank, two starter wires, onel for each group in each bank, andsmeans for sending an initial impulse over said starter wire, an auxiliary switch adapted to make and break an electrical Aconnection with said switch starter Wiresfor operatingifsaid "wipers, and means in one or morev of said ya f l 1,163,390*

iov

sii-itch to establish an electrical connection g with one set of wipeisand break the elec-` trical lconnection to the other'rs'et.

14.111 a switch such as describechhaving a plurality of banks, and a plurality of sets ofwipers for operating therewith, subscribers stations arranged in groups, one or more groups being connected to one bank and one oi" more groups connectedto the other bank` two starter wires, one for a group in -each bank, means lfor sending ali-initial im?. pulse over' one of said starterwires, an aux-- vrliary switch adapted to 'inake and break an electrical connection with 'said switch wipers, and means in one or more of said n yplurality ot' s ctsof banks with a plurality of sets; ot' Wipers, means for establishing an' electrical coniiectioitto one set of wipers and breaking theconnection with another' set `of wipers,` two 'for' 'more Istartery `ivires, oneforeach hai'tikziilfnieaiisin one of said starter wires ,foi-l effecting the electrical connection {Vith-said switch wipers, and meansV in' said. siijitch for extending both of' saidI sta-rter Wires to another switch after the v1switchhas been operated to establish a connection4 in onel `of the banks.

1d. In a switch such as describedh/aving a plurality of sets of banks witha plurality of sets of Wipers, means for; establishing an.

electrical connection rto one set oit' Wipers and breaking the' connection with another set of Wipers, two or more starter wires, one

starter Wires for etlecting the electrical connection with said switch Wipers, and means in said switch for extending both of said starter wires to another switch after the switch has been operated :to establish a con.

nelction in onel of the banks, and other'ineans involving a slow' relay for holding said starter wire extensions open until the switch has ceased operating ,in making a bank con- 'nectionf 17. In an automatic switch having a se- ,ries of terminal contacts arranged in banks and wipers arranged in sets, one set for each bank, a trunk circuit normally connected for eachbank4 and means in one of said with one set'of wi ers. andl means for elecfrom said trunk and electrically connecting another set from said trunk as the switch is operated, and means for 'restoring the normal condition of Pthe wipers vwhenft'he switch is restored to normal position.

In testimony whereof, I have hereuntol set my 'hand this 31st day of October 1911.

WILLIAM M. Brauen. JR.

v1l/Vitnesses: 2

Giras. I. WELCH,4

Erm M. Sm'rir.l l

' trically disconneetingaone set of kwipers 

